How long is your maximum load,
Deck width required. (The maximum width for a light simple trailer (including its load) is 2.55 metres (excluding side marker lights and direction indicators and the bulge towards the bottom of the tyre))
Type of tie downs; track, full length tube, individual loops
Deck type; truck deck non slip full width, steel or aluminium tread plate full or part width, Steel or aluminium flat plate full or part width
Mag wheel or 4mm truck steel wheels for those extra heavy loads and harsh environments.
Winch with left and right snatch blocks or centre mounted
Here is a link to the NZTE light trailer specifications for New Zealand